Valve.



Nd. 740,157. PATENTS!) SEPT. 29, 1903..

P. MERTSHEIME.RL

VALVE.

v nrmunxon FILED FEB. 24. 1903 2 snms-snm 1.

R0 MODEL.

* ,mw' m LIIIIIIIIIIIIIIIIIIHI lmmmo I PATENTBD SEPT. 29, 1903.

F. MERTSHEIMER.

VALVE.

APPLICATION FILED r1112. 24. 1903.

2 SHBETSSHEET 2.

N0 MODEL.

NiTE

S ress Eatented September 29, 1903. 1

VALVE.

SPECIFICATION forming part of Letters Patent No. 740,157, dated September 29, 1903.

I Application filed February 24, 1903. Serial No. 144,749. (No model!) To all whom it may concern:

Be it known that I, FREDERICK Mnnrs- HEIMER, of Denver, county of Arapahoe, and State of Colorado, have invented a new and useful Improvement in Valves, of which the following is a specification.

This invention relates to valves, and has reference more particularly to what are known in the art as blow-off valves, which are used in connection with locomotive or other boilers. In the use of these valves it frequently happens that scale from the boiler will lodge between the valve and its seat, so that the val we is prevented from eiiectually closing, and a leakage of water from the boiler results. It is the aim of my invention to avoid the liability of leakage from such causes; and my invention consists in the combination, with a valve-casing having an opening in communication with the boiler and provided with a valve-seat, of a plug-valve adapted to said seat and having in its side an opening arranged to be brought in register with that in the valve-casing or adjusted out of register with it, and a disk valve situated within the plugvalve and adapted to be seated on a valve-seat independent of that of the plug-valve and controlling the passage of fluid through the casing and the opening in the plug-valve, and means for opera-ting said valves independently, whereby in the event of leakage of the disk valve the plug-valve may be turn ed an d cut off communication with the boiler, after which access may be had to the disk valve and the leakage corrected.

The invention consists also in the details of construction and combination of parts hereinafter described and claimed.

In the accompanying drawings, Figure 1 is a vertical longitudinal section through my improved valve. Fl 1 is a similar view showing the parts in a diiierent position. Fig. 3 is a side elevation of the valve. Fig. 4 is a top plan view of the same.

Referring to the drawings, 1 represents a valve-casing, which is provided in its side with an opening 2 in communication with the boiler and inits bottom with an opening 3 for the escape of the water. This casing is tapered on its interior above the opening 3, so as to form a tapered valve-seat in which is seated and mounted to rotate a plug-valve 7 having in its side an opening 8, which may be brought in register with the opening 2 in the valve-casing to permit the passage of the fluid, as shown in Fig. 1, or which may be adjusted out of register with said opening, so as to close the communication through the valvecasing, as shown in Figv 2. This plugvalve is hollow and is formed with an'extension or neck 9, which passes upward through the top of the casing, within a stufling-box 10 therein, and has its end exposed on the outside of the casing, where it has attached to it a laterally-extending handle 11, by which the valve'may be turned so as to open or close communication, as desired. This handle is furnished with a downwardly-extending pin 12, which is adapted to contact with a stoplug 13 on the side of the valve-casing, so as to indicate the position of the valve whether open or closed.

14 represents a disk or lift valve which is situated within the plug-valve and which is adapted to seat against a sloping valve-seat 6, situated below the-lower end of the plugvalve. This lift-valve is adapted to be moved longitudinally to and from its seat to open or close communication through the casing, and for this purpose the interior of the plugvalve is large enough to permit the lift-valve to move across and clear of the opening 8, so as to give the water and scale a clear and unob- -structed passage from the boiler to theoutside. This movement of the lifting-valve is effected by means of a stem 13 in the form of a rod attached at its'lower end to the valve and extending within the neck 9 of the plug-valve and through. the same and through'a stuffingbox 14: in said neck and through its upper end, where it is providedwith a slotted head 15, having a bolt 16 therein for the engagement of a'lifting-lever. This valve 14 is employed to normally control the passage of the fluid through the casing and incidentally through the plug-valve,which latter when in operation is adjusted to an open position, as shown in Fig. 1. If, however, there is aleakage between the seat of the valve 14 and the valve such as would be caused by the lodgment of'a scale the plug-valve is turned on its seat to the position shown in Fig. 2, thereby adjustmunication with the b'oilen. Access may then be had to the disk valve and its seat through the bottom of the casing, which is provided with a threaded neck, to which an elbow 16* is secured by a cap-nut 17.

It will be observed that both valves close against seats formed on the casing, which seats are independent of each other, and that both valves are provided with extensions or stems which project through the casing to the outside, where they are adapted to be operated independently, a stul'fing box 'surrounding the stem of the plug-valve, between it and the casing, and a second stuffing-box surrounding the stem of the lift-valve, between it and the stem of the plug-valve.

In order that when the plug-valve is turned to establish communication through the easing in the normal operation of the valve, as shown in Fig. 1, it may be firmly held in this position, I'provide a set-screw 20, which is tapped through thetop of the casing and has its lower end in position to bear against the upper side of the plug-valve. \Vhen the plug-valve is to be turned to close communication through the casing, this set-screw is unscrewed, which will release the valve and permit it to be turned.

Having thus described my invention, what I claim is- 1. In a valve the combination with a casing having a passage-way through it and provided with a valve -seat, of a plug valv'e formed to fit said seat and having an opening in its side adapted to be brought in register with the passage-way in the casing, a lift valve situated within the plug-valve and movable freely across its side opening,a valve-seat on the casing below the plug-valve and independent-thereof against which the lift-valve is adapted to seat, means for operating the lift-valve from the outside of the casing, and means for operating the plug-valve also from the outside of the casing and independently of thelift-valve.

2. In combination with a valve-casing having an opening therethrough, a rotary plugvalve mounted in the casing and provided with an opening adapted to register with that in the casing, a hollow stem connected with the plug valve and extending through the casing to the outside, a stuffing box surrounding said stem within the casing, a liftvalve situated centrally within the plug-valve and movable freely therein, a valve-seat on 3. In combination with a valve-casing havin g a passage-way therethrough and provided with a tapered valve seat, a tapered rotary plug-valve adapted to said seat and arranged to be adjusted to open or close the opening through the casing, means for operating the plug-valve from the outside of the casing, a locking device mounted on the casing and adapted to engage the plug-valve within the casing, and acting to force the plug-valve on its seat, a lift-valve situated within the plugvalve, a valve-seat on the casing with which the lift-valve is adapted to cooperate, and means for operating said valves independently of each other.

4. In combination with a valve-casing having a passage-way therethrough and provided with a tapered seat, a rotary plug-valve adapted to said seat and formed with an opening arranged to be adjusted in communication with the passage and adapted also to close said passage, means for locking the plug-valve normally in an open position, a hollow stem on the plug-valve extending through the casing to the outside, a handle on the hollow stem, a stop on the valve-casing adapted to be engaged by said handle, a second valve situated within the plug-valve, a valve seat on the casing below the plugvalve and independent of the seat of the plug-valve against which the second valve is adapted to close, said second valve being movable to and from its seat independently of the plug-valve, and serving to control normally the passage of fluid through the plugvalve and casing when the former is in an open position, and a stem on the second valve extending through the hollow stem of the plug-valve to the outside of the casing and formed with'an operating-head.

In testimony whereof I hereunto set my hand, this 10th day of February, 1903, in the presence of two attesting witnesses.

FREDERICK DIERTSHEIBIER.

Witnesses: I

IVIELVIN EDWARDS, RoBT. P. ROLLINS..

IOO 

